1. 效果

2.思路

點擊豌豆射手卡片，生成卡片，并將觸摸事件傳遞給卡片，以便卡片能移動

2.1 第1觸摸事件

Activity 的觸摸事件

package com.su.botanywarzombies;public class MainActivity extends Activity {private GameView mGameView;@Overridepublic boolean onTouchEvent(MotionEvent event) {return mGameView.onTouchEvent(event);}

2.2 第2觸摸事件

mGameView 中的卡片選卡觸摸事件

public class GameView extends SurfaceView implements SurfaceHolder.Callback, Runnable {@Overridepublic boolean onTouchEvent(MotionEvent event) {// 第一圖層，背景圖和放置狀態(tài)欄的卡片for (BaseModel model : gameLayout1) {if (model instanceof TouchAble) {if (((TouchAble) model).onTouch(event)) {// true 表示觸摸事件到此為止不再響應return true;}}}

2.3 第3觸摸事件

豌豆射手卡片被點擊事件

public class SeedPea extends BaseModel implements TouchAble {@Overridepublic boolean onTouch(MotionEvent event) {int x = (int) event.getX();int y = (int) event.getY();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:// 判斷是否點擊了卡片，根據(jù)是否焦點在觸摸區(qū)域范圍內(nèi)if (touchArea.contains(x, y)) {Log.d("sufadi", "touch seed pea");applyEmplacePea();return true;}default:break;}return false;}

2.4 第4觸摸事件

申請一張卡片，并且獲取觸摸事件，已方便位移操作

2.4.1 請求安放一個卡片

public class SeedPea extends BaseModel implements TouchAble {// 請求安放一個卡片private void applyEmplacePea() {// 向 GameView圖層加GameView.getInstance().applyEmplacePea(locationX, locationY);}

2.4.3 GameView 新增該卡片

public class GameView extends SurfaceView implements SurfaceHolder.Callback, Runnable {public void applyEmplacePea(int locationX, int locationY) {synchronized (mSurfaceHolder) {// 頂層加入被安放狀態(tài)的植物Log.d("sufadi", "applyEmplacePea add EmplacePea");gameLayout1.add(new EmplacePea(locationX, locationY));}}

2.4.3 GameView 繪制該卡片，見圖層 gameLayout1

注意下面的圖層是有先后順序的

public class GameView extends SurfaceView implements SurfaceHolder.Callback, Runnable {private void onDrawing(Canvas mCanvas) {for (BaseModel model : gameLayout2) {model.drawSelf(mCanvas, mPaint);}// 后畫的會覆蓋先畫的，故位置在gameLayout2下面if (gameLayout1 != null && !gameLayout1.isEmpty()) {for (BaseModel model : gameLayout1) {model.drawSelf(mCanvas, mPaint);}}}

2.4.4 GameView 傳遞觸摸事件

注意下面的圖層是有先后順序的

public class GameView extends SurfaceView implements SurfaceHolder.Callback, Runnable {@Overridepublic boolean onTouchEvent(MotionEvent event) {// 第一圖層，背景圖和放置狀態(tài)欄的卡片for (BaseModel model : gameLayout1) {if (model instanceof TouchAble) {if (((TouchAble) model).onTouch(event)) {// true 表示觸摸事件到此為止不再響應return true;}}}// 第二圖層，安放卡片for (BaseModel model : gameLayout2) {if (model instanceof TouchAble) {if (((TouchAble) model).onTouch(event)) {// true 表示觸摸事件到此為止不再響應return true;}}}return false;}

2.4.5 卡片的移動事件

public class EmplacePea extends BaseModel implements TouchAble {// 觸摸區(qū)域private Rect touchArea;@Overridepublic boolean onTouch(MotionEvent event) {int x = (int) event.getX();int y = (int) event.getY();if (touchArea.contains(x, y)) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:break;case MotionEvent.ACTION_MOVE:// 卡片位置更新locationX = x - Config.peaFlames[0].getWidth() / 2;locationY = y - Config.peaFlames[0].getHeight() / 2;// 觸摸點跟隨，重新移到新的位置touchArea.offsetTo(locationX, locationY);break;case MotionEvent.ACTION_UP:break;default:break;}}return false;}

2.4.6 上述步驟每60秒不斷繪制，故圖片順利移動

public class GameView extends SurfaceView implements SurfaceHolder.Callback, Runnable {@Overridepublic void run() {while (gameRunFlag) {// 這里需要考慮線程同步synchronized (mSurfaceHolder) {try {// 鎖住畫布才能繪圖mCanvas = mSurfaceHolder.lockCanvas();mCanvas.drawBitmap(Config.gameBg, 0, 0, mPaint);// 放置卡片的起始 X 坐標是 (界面寬度-卡片寬度) / 2mCanvas.drawBitmap(Config.seekBank, (Config.screenWidth - Config.seekBank.getWidth()) / 2, 0, mPaint);onDrawing(mCanvas);} catch (Exception e) {// e.printStackTrace();} finally {// 解鎖并提交mSurfaceHolder.unlockCanvasAndPost(mCanvas);}}try {Thread.sleep(60);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

3. Demo 下載

https://github.com/sufadi/BotanyWarZombies

總結(jié)

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